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Trigonometric function problem of arbitrary angle in mathematics high school.
Known plug card/root number (1- symplectic 2A)+ tana/root number (CSC 2A- 1) = 1.

That is, (1/COSA)/| COSA |+tana/| COTA | =1.

1/(cosa * | cosa |)+tana * | tana | = 1

Because there is 1/cos 2a = 1+tan 2a.

Therefore, there is cosa & gt0 and tana < 0.

That is, a is the angle of the fourth quadrant.

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